Door security system

Abstract

A multi-position door security system that provides a primary locked position keeping a closed door secure and also providing varying degrees of secure openings to allow a user to see outside or accept envelopes and packages through an opening. The invention is formed of a cable and a locking bracket which is attached to the frame of the house. The cable is looped and secured around a door knob and is then passed through one or two keyway openings in the locking bracket. One or more locking fitting are rigidly attached to the cable. The locking fittings are sized such that they do not fit through the openings of the locking bracket. This allows the user to choose how far the door will open by choosing which of the locking fittings engage the locking bracket. The invention also allows for easy disengagement by the user in case of fire or emergency. Because of the design and materials used in construction, the invention is secure, economical and easy to install. The present invention is used to secure swinging and sliding doors.

What is claimed is: 
     
       1. A door security system for a knob or handle operated door mounted onto a physical structure, said door security system comprising: (a) a cable, said cable comprising a first end, a second end, a tail and a loop segment;   (b) a cable end stop fitting, said cable end stop fitting attached to said first end;   (c) a slip fitting, said slip fitting comprising a first channel and a second channel, and said cable passing through and slidable in both said first channel and said second channel;   (d) said loop segment being a length of said cable located between said first channel and said second channel, whereby said loop segment is placed around the knob or the handle of the door;   (e) said cable end stop fitting inhibiting the passage of said first end through said slip fitting;   (f) a locking fitting, attached to said cable and located between said loop segment and said tail; and   (g) a locking bracket comprising a keyway, said locking bracket for being affixed to the physical structure, wherein said cable is placed into said keyway and said locking fitting prohibits the sliding passage of said locking fitting through said keyway in the direction of motion of the cable that increases the degree to which the door can be opened.   
     
     
       2. The door security system of claim 1 wherein said cable can be pulled out of said keyway by grasping, pulling and manipulating said tail, whereby the door security system is released and the door is free to open. 
     
     
       3. The door security system of claim 2 further comprising a plurality of said locking fittings attached to said cable. 
     
     
       4. The door security system of claim 1 further comprising a second keyway located in said locking bracket, wherein said cable is placeable into said second keyway. 
     
     
       5. The door security system of claim 4 wherein said first keyway and said second keyway are L-shaped and point in opposing directions. 
     
     
       6. The door security system of claim 4 wherein said locking bracket further comprises a locking post, said cable being wrapable around said locking post. 
     
     
       7. The door security system of claim 4 further comprising a plurality of said locking fittings attached to said cable. 
     
     
       8. The door security system of claim 1 further comprising a plurality of said locking fittings attached to said cable. 
     
     
       9. The door security system of claim 1 wherein said keyway is T- shaped. 
     
     
       10. The door security system of claim 1 wherein said keyway is round. 
     
     
       11. A door security system for a knob or handle operated door mounted into a physical structure, said door security system comprising; (a) a cable, said cable comprising a first end, a second end, a tail and a loop segment;   (b) a slip fitting, said slip fitting comprising an attachment point and a cable channel, said first end of said cable attached to said slip fitting at said attachment point, and said cable passing through and slidable in said cable channel;   (c) said loop segment being a length of said cable located between said first end and said cable channel, whereby said loop segment is for being placed around the knob or the handle of the door;,   (d) a locking fitting, attached to said cable and located between said loop segment and said tail; and   (e) a locking bracket comprising a keyway, said locking bracket for being affixed to the physical structure, wherein said cable is placed into said keyway and said locking fitting prohibits the sliding passage of said locking fitting through said keyway in the direction of motion of the cable that increases the degree to which the door can be opened, and where said cable can be pulled out of said keyway by grasping and pulling said tail, whereby said door security system is released and the door is free to open.   
     
     
       12. The door security system of claim 11 further comprising a second keyway located in said locking bracket, wherein said cable is placed into said second keyway. 
     
     
       13. The door security system of claim 12 wherein said first keyway and said second keyway are L-shaped and point in opposing directions. 
     
     
       14. The door security system of claim 13 further comprising a plurality of said locking fittings attached to said cable. 
     
     
       15. The door security system of claim 12 wherein said locking bracket further comprises a locking post. 
     
     
       16. The door security system of claim 12 further comprising a plurality of said locking fittings attached to said cable. 
     
     
       17. The door security system of claim 11 further comprising a plurality of said locking fittings attached to said cable. 
     
     
       18. The door security system of claim 11 wherein said keyway is T- shaped. 
     
     
       19. The door security system of claim 11 wherein said keyway is round.